Circular Connectors with PCB Contacts

Amphenol provides circular connectors with PC Tail contacts for solder mounting on printed circuit boards. They are available in MIL-DTL-38999 Series I, II, and III, MIL-DTL-26482, and MIL-DTL-5015 Connectors. These connectors incorporate PCB contacts in sizes 16, 20, and 22D.

Guide to Selecting a PCB Circular Connector

The tail length of the PCB is the portion of the contact that extends beyond the rear of the shell. This length will vary in relationship to the mounting flange, depending on the series of connector selected. Standard lengths are shown on the connector shell style drawings in the product links. These shell style drawing also provide how to order part numbering for standard PCB cylin­drical connectors. When computing the desired tail length, it is important to take into consideration the following factors:

The connector series and shell style.

The mounting style of the receptacle; jam nut (D hole) or panel mount (four holes). This can affect the overall length of the tail.

The extension of the tail beyond the opposite side of the board or the flex.

The space required to adequately clean flux from between the board or flex and the rear of the connector shell. Connectors that are mounted flush against the board may trap soldering flux which could lead to corrosion of the solder joints.

The answer is yes. Any mechanical methods needed to stabilize the board or flex to the connector and/or the panel is beneficial. The PCB tails shown in this catalog are of one diameter. Stepped tails or PCB tails with an increased diameter on a designated portion may be required for certain applications.

Alignment discs are available which provide ease of alignment of pins to boards, protection during shipment and optimized electrical circuit separa­tion. Header assemblies are available which provide time and cost saving potentials. Standoffs may be required for certain applications. Amphenol has developed a new stand-off adapter which may elimi­nate the need for special stand-off shell designs. Connectors with clinch nuts can be provided. Please call Amphenol to discuss any optional designs or any special requirements.

The outside diameter of the PCB tail is determined by the inside diameter of the plated through-hole on the board or flex print. The standard or most popular diameters are shown in the Insert Arrangement charts D38999 and 2M and are called out in the connector illustrations.

The standard PCB tails for MIL-DTL-38999 receptacles have gold plating,.00005 inches over nickel. Amphenol can substitute a pre-tinned version of these tails to facilitate the termination process. This pre-tinning is a 60/40 lead-tin alloy. Call Amphenol for further information on pre-tinning and any other plating of contacts not covered in this catalog.

Flex prints can radically simplify the assembly of a connector to a system, as well as eliminate wiring errors. Amphenol offers connector flex assemblies through Amphenol Printed Circuit division. Features and bene­fits of using flex technology include:

Amphenol manufactures a complete series of MIL-DTL-38999 Series I, II, and III Connectors with Press Fit compliant pin contacts for solderless mounting on printed circuit boards. Both pin and socket contacts are available in any MIL-DTL-38999 Series I, II or III insert pattern having contact size 16, 20 or 22D. Available in Mil-Spec and custom shell configurations.

Benefits include:

High speed, low cost board assembly

Elimination of soldering thermal stress

No cold soldered joints

No short circuits by soldered connections

No cleaning of excess flux

Optional contact for piercing conformal board coating is available

Press fit connectors accommodate boards with minimum 0.090 inch thickness and 0.040 +/– .003 plated through holes. The insertion force for mounting the connector on the board is 7 to 16 pounds per contact. Refer to L-40450-207 for installation instructions. Contact Amphenol Aerospace for ordering information.

Contact: PCB Connectors

Joe Ryder

607-563-5001

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